Device for aiding the hearing.



E. W. SCHNEIDER; DECDJ E. C. SCHNEIDER. EXECUTIIX- nevmgron Moms m mama.

APPLICATION FILED SEPT-9. I916.

Patentd Mar. 20, 1917.

UNITED STATES PATENT OFFICE.

EUGENE 'w. soHNEIDER, DECEASED, LATE E NEiW YORK; N.

SCHNEIDER, ExEcU'rRIx, OF NEW YORK, N.

Y2, BY ELIZABETH. o.

DEvIcE EoR 'AIDI- G THE HEARING.

Specification of Letters Patent.

Patented Mar. 20, 1917'.

To all 'wliom it may concern:

. Be it known that EUGENE W. SCHNEIDER,

deceased, late a citizen of the United States, and resident of Jamaica, city of New York, county of Queens, State of New York, did invent certainnew and useful Im orovements in Devices for Aiding the caring, of which the following is a full, clear, and an I act description.

This invention relates to improvements in telephonic devices for aiding the hearing, of the type shown in my former Patent, No. 1,192,122.

The objects of this invention reside in the simplification and improvements of the transmitter shown in the aforesaid patent. Other objects reside in the provision of an improved and simplified rheostat than the previously shown rheostat.

will be pointed out indetail in the accompanying specification; I

In the drawings:

Figure 1 shows a rear view of the transmitter with cover plate over the switch removed.

Fig. 2 is'a front view with the front cover which carries the sound concentrating shells, removed. This iew shows the arrangement of the coils of resistance wire which form a part of the rhcostate Fig. 3 is a view similar to Fig. 2 but with resistance coils, the microphone electrode and certain other parts removed to show the. construction.

Fig. 4 is a central section view of the transmitter.

In more detail, the transmitter is provided with clip terminals 1011 which may be directly mounted. upon a battery as shown in the patent previously referred to or which may be connected to the battery by wires as shown. The casing of the transmitter is composed of a box 13 and ascrew cover 14 which carries sound concentrating shells 15 of the type shown in Patent to Schneider,

- No. 1,192,123. To prevent opening of the casing by the unskilful user, the cover is locked on the box by a pointed device 16 controlled by an eccentric device 17. With the pointed device and eccentric in the positiguous threads of the cover so that if the Other objects attempt is made to unscrew the latter. the point will bite into the metal '(preferably aluminum) and 'so prevent further turning. The head of the screw 18 is concealed under a cover plate 19 as shown in Fig. 1. VVhen' the cover plate 19 is removed .the headof screw 18 is accessible so that may be applied to turn the eccentrioand retract the pointed device.- Inside the transmitter-casmg and fastened to a boss 20-whi'ch is-insulated from and secured to the casing is a microphone electrode 25 in the usual form of a carbon disk having pockets containing' globular carbon in contact.with the vibrating diaphragm 26. The boss and electrode are electrically connected througl'i their fastening screw. The boss also forms a support for a bracket 27 which is insulated from both boss and easing. This insulated bracket carries abindingcpost 28 to which leads a wire 29 extending to the receiver (not shown). A conducting strip 30 connects the binding 'o'st 28 with one-end of a resistancr wire. his wire is loopedin the form of a series of coils 31 which are ,wound upon an arcuate insulating strip which is fastened to the interior of'thecasing. The coils 31 are electrically connected to a series of taps 32 which extend through 'an arcuate insulating block 33 and which have rounded contact points 34: thereon which are concentric about the cente'r'of the boss as shown in Fig. 1. w

The resistance switch 35 is of spring metal and is pivotally held against the .end of the boss by a screw. The switch has a capped end which makes contact with the contact points 4. and the width 'of this end is such that in shifting from one contact a screw driver noying clicks which would occur if the-circuit were broken during the operation of the rheostat. One end of the switch 35 carries a handle 36 which projects through an arcuate slot in the coverplate 19 in accessible position to a user of the instrument.

Inside the casing are two arcuate shaped strips 37 and 38. Strip 37 is insulated from the casing and serves to conduct current from the terminal 10 to wire 39 which leads to one side of the rec iver. Strip 38 is in electrical contact with the casing and connects with the opposite terminal 11.

The circuit through the transmitter is as follows. Current flows in atterminal 10 (Fig. 3.) through 37, 39 through receiver back through wire 29, binding post 28, and into coils 31 thence through one of the taps 3'2, contacts 33, to switch which is electrically connected with boss 20. The current flows through the boss '20, microphone electrode- :25 diaphragm 26, conducting casing 13 to strip 38 and out to battery at terminal 11. By varying the position of the switch 35 more or less of the resistance coils 31 can be thrown in or out and the strength of current can be controlled as will be readily understood. Under the end of the end of the switch 35 which carries the handle 36 there is preferably placed a sector shaped sheet of insulating material 40 to insulate the switch from the casing. The switch also has a struck up portion 41 which contacts with the boss and maintains the operating button without the slot in the cover plate.

\Vhat I claim as the invention of thesaid Encnxn Y. Scum-none, deceased, is:

1. In a telephonic apparatus for aiding the hearing. the combination of a transmitter having a conducting casing. a boss centrally disposed in the rear wall of the said casing, a microphone thereto, a series of resistance coils within the casing, an arcuate insulating block in the back wall of the casing, taps and contact points therein, said taps being connected with resistance coils, said contact points being concentrically disposed about the said boss and a switch arm pivoted upon the outer end of the said boss and adapted to be shifted to contact with any desired contact electrode secured point whereby the strength of current throu h the microphone is controlled.

2. n a telephonic apparatus for aiding the hearing in combination, a transmitter having a conducting casing, a microphone electrode therein, a rheostat for varying the strength of current passing therethrough, said rheostat comprising a plurality of coils of resistance wire, a plurality of taps leading therefrom, contact points connected with the said taps, a switch adapted to be rotated to contact with any one of the contact points, said switch being adapted to bridge over two contacts whereby the circuit is never broken, a cover plate having an arcuate slot therein mounted upon the rear of the said casing and a switch handle attached to the switch and projecting through the said arcuate slot into a position accessible to the user.

3. In a telephonic apparatusfor aiding thehearing in combination a transmitter hav ing a conducting casing, a conducting boss in the center of the rear wall of the said casing and insulated therefrom, and arcuate insulating block concentrically disposed about the said boss, concentrically arranged contact points therein, resistance coils and taps connecting the coils with the contact points, a switch arm pivoted upon the said boss and adapted to make a contact with each of the said contact points a cover plate, an arcuate slot therein and a switch operating handle carried by the switch and projecting through the arcuate slot in the cover plate.

ELIZABETH C. SCHNEIDER,

E'acccutrix of Eugene WJSchneider, de-

ceased. 

